Subtract -3k from -2k

Ined this is due tomorrow and i dont know the answer can you find all the exponents

Suppose a store sells an average of 80 cases of soda per day. assume that each case contains 24 cans of soda and that the store is open 10 hours per day. find the average number of soda that the store sells per hour.

How to simply and write the answer n a whole number